relax SVN archive

Fixes to the docstring of the generic_fns.diffusion_tensor.set() function.

The fact that the function cannot be used to initialise a tensor is now stated.

Bug fix for the generic_fns.diffusion_tensor.set() function.

If no diffusion tensor exists, then a RelaxError is thrown when trying to set the parameters. It's
not possible to create a tensor from scratch as the tensor type is unknown.

Fixes to the docstring of the generic_fns.diffusion_tensor.set() function.

Bug fix for the generic_fns.value.set() function.

The diff_values variable is now called tensor_values.

Bug fix for the param arg unit test of the value.set() user function.

Lists are now properly checked.

Bug fix for the val arg unit test of the value.set() user function.

An elif loop was incorrect.

Updated the value.set() user function.

More comments were added to the code, and empty lists passed in as the param argument are now
checked for.

Updated the val arg unit test of the value.set() user function.

The unit test now properly checks the arg when a list is passed into it.

Bug fix for the value.set() user function.

Empty lists are now caught.

Implemented the generic_fns.minimise.reset_min_stats() function using the new relax design.

This was copied from the old reset_min_stats() class method but has had a few significant changes
made to it. Now both the sequence specific and global min stats are reset all together by one call
to the function.